catalogues and names

The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version)

SKY2000 - Master Star Catalog

Smithsonian Astrophysical Observatory Star Catalog

Combined General Catalogue of Variable Stars (Vol. I-III)

catalogues and names

catalogues and names	w Gem, ome Gem, 42 Gem, HR 2630, HD 52497, SAO 78999, BD +24 1502, FK5: 1182
constellation	Gemini

data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)

position, motion, parallax:

position (J2000)	RA: 7h 2min 24.8sec	DEC: +24° 12' 55''
position (2000.72)	RA: 7h 2min 28sec	DEC: +24° 12' 51''
position (B1900)	RA: 6h 56min 19.2sec	DEC: +24° 21' 29''
proper motion (J2000)	RA: -0.009 arcsec/a	DEC: -0.001 arcsec/a
radial velocity	-9 km/s
rotational velocity	<19 km/s
trigonometric parallax	0.012 arcsec
galactic coordinates	longitude: 192.18°	latitude: 13.06°

magnitude

visual magnitude

5.18 (V on UBV Johnson system)

spectral / color information

spectral class	G5IIa-Ib
B-V-magnitude	0.94
U-B-magnitude	0.68

note (category: spectra):

Barium star.

variability information

variable star identification

Ome Gem

note (category: variability):

Cep?, amp. 0.086V, 0.7282d.

data from SKY2000 - Master Star Catalog (Myers+ 1997)

position, motion, parallax:

position (J2000)	RA: 7h 2min 24.773sec	DEC: +24° 12' 55.47''	±0.06 arcsec	source: 15
position (2000.72)	RA: 7h 2min 28sec	DEC: +24° 12' 51''	JD: 2451806.31
proper motion (J2000)	RA: -0.0006 arcsec/a	DEC: -0.001 arcsec/a		source: 25
radial velocity	-9 km/s			source: 25
trigonometric parallax	0.012 arcsec		±0.001 arcsec	source: 25
galactic coord. (B1950)	longitude: 192.19°	latitude: 13.06°

magnitude:

visual	5.1 (observed)	source: 31
photovisual	5.2	source: 2

spectral information:

spectral class	K0		source: 96
Morgan-Keenan	G5IIa-Ib		source: 25
B-magnitude	6.12 ±0.05	B-V-magnitude	0.94
U-magnitude	6.8 ±0.05	U-B-magnitude	0.68

variability information:

source of data: 30

variability type	113
var. amplitude	0.09
var. period	0.73

sources:

2	HD and HDE Catalogs
Cannon, A.J., and E.C. Pickering, Harvard Annals, Vols 91-99, 1918-24, Cambridge, Massachusetts: Harvard University; Cannon, A.J., Harvard Annals, Vol. 100, 1925-36, Cambridge, Massachusetts: Harvard University; and Cannon, A.J., and M. Walton Mayall, Harvard Annals, Vol. 112, 1949, Cambridge, Massachusetts: Harvard University
15	FK5, FK5 Extension and FK5 Supplement
Fricke, W., H. Schwan and T. Lederle, "Fifth Fundamental Catalogue (FK5), Part I. The Basic Fundamental Stars," Veroff. Astronomisches Recheninstitut, No. 32, Heidelberg, Germany, 1988, and Fricke, W., H. Schwan, and T.E. Corbin, "Fifth Fundamental Catalogue (FK5), Part II. The FK5 Extension," Veröff. Astronomisches Recheninstitut, No. 33, Heidelberg, Germany, 1991
25	Bright Star Catalogue, 5th edition
Hoffleit, D. and Warren, W.H. Jr., The Bright Star Catalogue, 5th Revised Edition, Version 2, 1994
30	GCVS, 4th edition
Kholopov, P.N., et al., General Catalogue of Variable Stars, fourth edition, Moscow: Nauka Publishing House, 1985-88
31	CRM' (non-GCVS variable data)
Warren, W.H. Jr., Northern Hemisphere Catalog of Red Magnitudes, 1994
96	SAO or HD/HDE Catalog
Reference from Value 1 or Reference from Value 2

data from Smithsonian Astrophysical Observatory Star Catalog (SAO Staff 1966; USNO, ADC 1990)

position and proper motion:

position (B1950)	RA: 6h 59min 22.027sec	DEC: +24° 17' 18.71''	±0.005 arcsec
position (2000.72)	RA: 7h 2min 27sec	DEC: +24° 12' 52''	JD: 2451806.31
position (J2000)	RA: 7h 2min 24.778sec	DEC: +24° 12' 55.54''
proper motion B1950 (FK4)	RA: -0.0005 arcsec/a	DEC: -0.002 arcsec/a	±0.001 arcsec/a in RA ±0.001 arcsec/a in DEC
proper motion J2000 (FK5)	RA: -0.0006 arcsec/a	DEC: 0 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	5.2 (accuracy: 2 decimals)
source of visual magnitude data	Taken from the "Henry Draper Catalogue".

spectral information:

spectral class	K0
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue	FK4, catalogue number: 1182
Durchmusterung	BD+24 1502
Boss General Catalogue	9263
Henry Draper Catalogue	52497

data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)

position:

position (equinox 1950.0)

RA: 6h 59min 22sec

DEC: +24° 17' 19''

variability informations:

variability type	CEP:	pulsating variable star
magnitute at max. brightness	5.14
magnitute amplitude	0.086
photometric system	visual, photovisual or Johnson's V
period [d]	0.7282

spectral information

spectral class

G5II

references

to a study	Vol. I GCVS (see Kholopov et al. 1985-1988)
to a chart/photograph	no chart is avaible, but the star is contained in the 'Bonner Durchmusterung'

miscanellous

ID in the GCVS catalogue	38/9024
constellation	Gemini
notes on existence	The star is equivalent to '0390001 R'.

variability type description

variability type

description

CEP

Cepheids. Radially pulsating, high luminosity (classes Ib-II) variables with periods in the range of 1-135 days and amplitudes from several hundredths to 2 mag in V (in the B band, the amplitudes are greater). Spectral type at maximum light is F; at minimum, the types are G-K. The longer the period of light variation,the later is the spectral type. The maximum of the surface-layer expansion velocity almost coinciding with maximum light.